A number of environment variables can be used to configure the behavior of the library. There are also functions to configure this behavior in code. The environment variables are convenient when troubleshooting problems.
Endpoint Overrides
GOOGLE_CLOUD_CPP_DOMAINS_ENDPOINT=... overrides the EndpointOption (which defaults to "domains.googleapis.com") used by MakeDomainsConnection().
GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc: turns on tracing for most gRPC calls. The library injects an additional Stub decorator that prints each gRPC request and response. Unless you have configured your own logging backend, you should also set GOOGLE_CLOUD_CPP_ENABLE_CLOG to produce any output on the program's console.
See Also
google::cloud::TracingComponentsOptionGOOGLE_CLOUD_CPP_TRACING_OPTIONS=...: modifies the behavior of gRPC tracing, including whether messages will be output on multiple lines, or whether string/bytes fields will be truncated.
See Also
google::cloud::GrpcTracingOptionsOptionGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes: turns on logging in the library, basically the library always "logs" but the logging infrastructure has no backend to actually print anything until the application sets a backend or they set this environment variable.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-05 UTC."],[[["This document provides reference information for the domains environment in C++, listing available versions from 2.12.0 up to the latest release candidate 2.37.0-rc."],["Environment variables, such as `GOOGLE_CLOUD_CPP_DOMAINS_ENDPOINT`, can be used to configure the behavior of the library, particularly for troubleshooting and overriding endpoint options."],["Tracing can be enabled for gRPC calls via `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and further customized with `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`, which can provide logs, and alter how they appear."],["The `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` variable can be used to enable logging within the library, directing output to the program's console when no other logging backend is configured."],["While the variable `GOOGLE_CLOUD_PROJECT` can be used in tests and examples, it does not have any impact on the core functionality of the library."]]],[]]
